CVE-2026-53013 (GCVE-0-2026-53013)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF
Summary
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF macvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but macvlan_fill_info() conditionally includes it when port->bc_cutoff != 1. This causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb runs out of space, triggering a WARN_ON in rtnetlink and preventing the interface from being dumped. The bug can be reproduced with: ip link add macvlan0 link eth0 type macvlan mode bridge ip link set macvlan0 type macvlan bc_cutoff 0 ip -d link show macvlan0 # fails with -EMSGSIZE The bc_cutoff feature was added in commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff"), which added the nla_put_s32() call in macvlan_fill_info() but missed adding the corresponding nla_total_size(4) in macvlan_get_size(). A follow-up commit 55cef78c244d ("macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF") fixed the missing nla_policy entry but still did not fix the size calculation.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 4979252758387b338ca968ba7e0515b0ae2257e3 (git)
Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 77ecfa4e27f282d224215895ddfbeb916fc75e24 (git)
Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < b6b7154e9f5d75b608ceb2d05b376de8c638c40e (git)
Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 1c004f14ccdc11585625c168bb9a7c5e1b8afb0c (git)
Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < fa92a77b0ed4d5f11a71665a232ac5a54a4b055d (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF\n\nmacvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but\nmacvlan_fill_info() conditionally includes it when port-\u003ebc_cutoff != 1.\nThis causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb\nruns out of space, triggering a WARN_ON in rtnetlink and preventing the\ninterface from being dumped.\n\nThe bug can be reproduced with:\n\n  ip link add macvlan0 link eth0 type macvlan mode bridge\n  ip link set macvlan0 type macvlan bc_cutoff 0\n  ip -d link show macvlan0   # fails with -EMSGSIZE\n\nThe bc_cutoff feature was added in commit 954d1fa1ac93 (\"macvlan: Add\nnetlink attribute for broadcast cutoff\"), which added the nla_put_s32()\ncall in macvlan_fill_info() but missed adding the corresponding\nnla_total_size(4) in macvlan_get_size(). A follow-up commit\n55cef78c244d (\"macvlan: add forgotten nla_policy for\nIFLA_MACVLAN_BC_CUTOFF\") fixed the missing nla_policy entry but still\ndid not fix the size calculation."
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        {
          "url": "https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d"
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      ],
      "title": "macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF",
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    "datePublished": "2026-06-24T16:29:23.856Z",
    "dateReserved": "2026-06-09T07:44:35.378Z",
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    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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